General Science - Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.

71. What is the time taken by two consecutive compressions or rarefactions to cross a fixed point in a sound wave known as?

[A] Amplitude
[B] Time period
[C] Angular Frequency
[D] Angular Displacement

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72. What is the measure of the response of the ear to the sound known as?

[A] Pitch
[B] Intensity
[C] Loudness
[D] Amplitude

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73. In which of the following mediums will sound travel with greater speed at 0° C?

[A] Aluminium
[B] Water
[C] Hydrogen
[D] Same in all of the above

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74. Which of the following is correct about the speed of the sound, at same temperature?

[A] sound travels faster in humid air than in dry air
[B] sound travels slower in humid air than in dry air
[C] speed of sound is same in humid air and dry air
[D] None of the above

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75. What is the S.I. unit of absorptive power?

[A] dioptre
[B] metre
[C] ampere
[D] No unit

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76. What is the S.I unit of specific heat capacity?

[A] J kg-2 K-1
[B] J kg-1 K1
[C] J kg-1 K-2
[D] J kg-1 K-1

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77. What is the triple point of water?

[A] Temperature = -273.16 K, pressure= 6.11×10-6Pa
[B] Temperature = -273.16 K, pressure= 6.11×10-3 Pa
[C] Temperature = 273.16 K, pressure= 6.11×10-6 Pa
[D] Temperature = 273.16 K, pressure= 6.11×10-3 Pa

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78. What is the S.I unit of Stefan-Boltzmann constant?

[A] 2.34 × 10–4 W m–2 K–4
[B] 1.44 × 10–6 W m–2 K–4
[C] 3.99 × 10–7 W m–2 K–4
[D] 5.67 × 10–8 W m–2 K–4

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79. Which of the following is true about a cyclic process?

[A] the total heat absorbed equals the work done by the system.
[B] the system returns to its initial state
[C] Both a and b
[D] None

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80. What is the S.I. unit of power of a lens?

[A] metre
[B] watt
[C] dioptre
[D] second

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